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14512. Václav Petříček nestárne
- Creator:
- Jan Plesník
- Format:
- bez média and svazek
- Type:
- article, biography, text, články, journal articles, model:article, and TEXT
- Subject:
- Biologické vědy, Petříček, Václav, 1944 prosinec 29.-, biologie, ochrana přírody, ochrana krajiny, ekologové, výročí, biology, nature conservation, landscape protection, ecologists, anniversaries, 2, and 57/59
- Language:
- Czech
- Description:
- Jan Plesník.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
14513. Václav Prokop Diviš, Čech ze Žamberka, řádu premonstrátského
- Creator:
- Kraus, Ivo
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- Diviš, Prokop, 1698-1765, objevitelé a vynálezci, premonstráti, inventors, Premonstratensians, 6, and 53
- Language:
- Czech
- Description:
- Ivi Kraus. and Obsahuje bibliografické odkazy
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
14514. Václav Pumprla, Knihopisný slovník českých, slovenských a cizích autorů 16.-18. století
- Creator:
- Vojtěch Šícha
- Format:
- print, bez média, and svazek
- Type:
- article, recenze, reviews, model:article, and TEXT
- Subject:
- Historická věda. Pomocné vědy historické. Archivnictví, knihověda, databáze, spisovatelé, bibliology, databases, authors, 8, and 930
- Language:
- Czech
- Description:
- [autor recenze] Vojtěch Šícha.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
14515. Václav Tille (1867-1937)
- Creator:
- Klímová, Dagmar
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- literary historians, biography, Czech folk traditions, fairy tales, and Václav Tille
- Language:
- Czech
- Description:
- Autorka článku je uvedena se zkratkou křestního jména D.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
14516. Vacuole cysteine proteases and ribulose-1,5-bisphosphate carboxylase/oxygenase degradation during monocarpic senescence in cowpea leaves
- Creator:
- Srivalli, B., Bharti, Sudhakar, and Khanna-Chopra, Renu
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- endopeptidase, iodoacetamide, net photosynthetic rate, D,L-norleucine, phenyl methyl sulphonyl fluoride, pod, proteins, and Vigna unguiculata
- Language:
- Multiple languages
- Description:
- Characterisation of proteases degrading ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO, EC: 4.1.1.39) was studied in the cowpea leaf during monocarpic senescence 3 and 9 d after flowering (DAF), representing early and mid pod fill. The stage at 3 DAF coincided with decrease in the metabolic parameters characterising senescence, i.e., contents of total soluble proteins, RuBPCO, and leaf nitrogen. At 9 DAF, there was a decline in total soluble proteins and an appearance of a 48 kDa cysteine protease. Characterisation of the proteases was done using specific inhibitors. Subcellular localisation at 3 DAF was studied by following the degradation of RuBPCO large subunit (LSU) in the vacuole lysates using immunoblot analyses. Cysteine proteases played a predominant role in the degradation of RuBPCO LSU at the crude extract level. At 9 DAF, expression of cysteine protease isoforms was monitored using polyclonal antibodies against papain and two polypeptides of molecular masses 48 and 35 kDa were observed in the vacuole lysates. We confirmed thus the predominance of cysteine proteases in the vacuoles during different stages of pod development in cowpea leaf. and B. Srivalli, Sudhakar Bharti, Renu Khanna-Chopra.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
14517. Vajíčko, spermie, zkumavka… a gender. Postoje českých žen a mužů k asistované reprodukci a adoptivnímu rodičovství
- Creator:
- Slepičková, Lenka
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- ART (Artificial reproductive technologies), adoption, and gender differences
- Language:
- Czech
- Description:
- Reproductive medicine is one of the most progressive and most popular medicine branches. Its success and rapid development, together with the primacy of biological or genetic ties in the western construction of family is considered the main reason for decreasing popularity of adoption as the way of resolving involuntary childlessness. These assumptions are confronted with empirical findings about Czech population. The respondents of the survey conducted in the Czech households were asked about their preferences in the hypothetical situation of being confronted with physical infertility and about their attitudes towards various ways of solving it. The data showed that while infertility is actually constructed as a medical problem requiring high technology medical treatments, the adoption would not be considered a choice of last resort, after the failure of all procedures of artificial reproduction, including using donor gametes or embryo. Further, the data does not support the hypothesis of significant gender differences in these attitudes.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
14518. Valberg, A.: Light Vision Color
- Creator:
- Novák, J.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Language:
- Czech
- Description:
- Autor recenze: J. Novák
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
14519. Valení - teorie a experiment: gymnaziální studentský projekt
- Creator:
- Bartoš, Jiří, Musilová, Jana, and Vozdecký, Luboš
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- fyzika, valivé pohyby, středoškolští studenti, physics, rolling motions, and secondary school students
- Language:
- Czech
- Description:
- Problematika rotačních a valivých pohybů bývá považována studenty a často i učiteli fyziky za značně obtížnou. Plně obecné řešení problémů spojených s takovým typem pohybu (pohyb setrvačníků apod.) ovšem vyžaduje odpovídající matematický aparát, a pak je samozřejmě namístě s takovým názorem souhlasit. Na druhé straně je možné na zcela elementární úrovni, ať již středoškolské, či bakalářské, provést výklad i takových rotačních a valivých pohybů, jimž se nejen učebnice, ale i učitelé při přímé výuce raději vyhýbají. Dokladem jsou výsledky tohoto článku, jenž vychází z gymnaziálního studentského projektu z oblasti mechaniky valivých pohybů. Studuje různé aspekty valení, zejména podmínky pro valení bez prokluzu, popis valení s prokluzem a podmínky přechodu mezi nimi. Teoretické závěry jsou ověřeny pomocí jednoduchých experimentů. Data jsou zpracována pomocí softwaru Tracker, který je mimořádně vhodný pro využití na středoškolské úrovni, a poté porovnána metodou nejmenších čtverců s teortickým modelem. Ze závěrů studie je zřejmé, že úlohy uvedeného typu mohou dokonce řešit studenti velmi samostatně, samozřejmě s konzultační a materiální podporou. Na rozdíl od často viděných soutěžních prací z moderní fyziky, do jejíž podstaty středoškolský student v principu nemůže pronïknout (a práce buď zůstavá na povrchu, nebo se student stává pouhým účastníkem týmového výzkumu či pomocníkem vědeckého konzultanta), mají důsledně zpracované projekty z názornějších klasických, i když ne tak "atraktivních" oblastí fyziky zásadní význam pro prohloubení fyzikálního myšlení studentů., This paper presents results of a secondary school student project in rollng mechanics. Various aspects of rolling motions are studied, particularly conditions for rolling without slipping, a description of rolling with slipping, and conditions for transitions between the two. Theoretical results and conclusions are verified by simple experiments, the data being treated by an open source software, Tracker (appropriate for secondary school level use) and processed by the least squares method using theoretical models. It is demonstrated that rotational and rolling motions, considered difficult for students, can be treated elementarily even at the secondary school or university bachelor level and solved by students themselves and therefore demonstrate how such a project can develop their thinking., and Jiří Bartoš, Jana Musilová, Luboš Vozdecký.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
14520. Validation of approximation techniques for local total electron content mapping
- Creator:
- Krypiak-Gregorczyk, Anna, Wielgosz, Pawel, Gosciewski, Dariusz, and Paziewski, Jacek
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, ionosféra, ionosphere, GNSS, ionospheric delay, TEC, 7, and 551
- Language:
- English
- Description:
- The aim of this study was to assess the performance of several approximation techniques for ionospheric total electron content (TEC) mapping. Approximation techniques based on data-fitting with local or general two-dimensional polynomials, local planes or distance-dependent interpolation were applied and tested. For the ionosphere modeling, dual-frequency GPS data from Polish GBAS system (ASG-EUPOS) were used, and TEC was estimated together with hardware delays from phasesmoothed pseudoranges. Next, grids of vertical TEC values with spatial resolution of 0.25 degrees in both latitude and longitude were generated using the evaluated approximation techniques. Subsequently the grids were used to create regional TEC maps with 5-minute temporal resolution, and also to create ionospheric delay corrections for GPS positioning. The quality of the resulting ionospheric maps was tested twofold, firstly by comparison to high-quality CODE global ionosphere maps (GIM), which were generated using data from about 150 GPS sites of the International GNSS Service (IGS). Secondly, by creating double-differenced ionospheric delay corrections and comparing them to reference values derived from the reference network data processing. For the correction tests, two perpendicular baselines directed North-South (N-S) and West-East (W-E) and reaching up to 100 km were selected. The approximation methods were analyzed with a special emphasis on the diverse ionospheric conditions. For the testing, a quiet ionosphere day of 20 March 2012 and an active ionosphere day of 9 March 2012 were selected. The results show that the regional models properly represent the changing ionosphere, with the best results provided by data-fitting into local functions., Anna Krypiak-Gregorczyk, Pawel Wielgosz, Dariusz Gosciewski and Jacek Paziewski., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public